When I run rake db:migrate, I get the following error message. How to solve this?
C:\testror\depot>rake db:migrate --trace (in C:/testror/depot) ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate rake aborted! 182: operating system cannot run %1. - c:/ruby/lib/ruby/gem s/1.8/gems/ruby-postgres-0.7.1.2006.04.06-mswin32/./postgres.so c:/ruby/lib/ruby/gems/1.8/gems/ruby-postgres-0.7.1.2006.04.06- mswin32/./postgres .so c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:32:in `require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ dependenci es.rb:496:in `require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ dependenci es.rb:342:in `new_constants_in' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ dependenci es.rb:496:in `require' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ core_ext/k ernel/requires.rb:7:in `require_library_or_gem' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ core_ext/k ernel/reporting.rb:11:in `silence_warnings' c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/ core_ext/k ernel/requires.rb:5:in `require_library_or_gem' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_a dapters/postgresql_adapter.rb:7:in `postgresql_connection' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_a dapters/abstract/connection_specification.rb:291:in `send' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_a dapters/abstract/connection_specification.rb:291:in `connection=' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_a dapters/abstract/connection_specification.rb:259:in `retrieve_connection' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ connection_a dapters/abstract/connection_specification.rb:78:in `connection' c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/ migration.rb :294:in `migrate' c:/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/tasks/databases.rake:85 c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:546:in `call' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:546:in `execute' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:541:in `each' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:541:in `execute' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:508:in `invoke_with_call_c hain' c:/ruby/lib/ruby/1.8/thread.rb:135:in `synchronize' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:501:in `invoke_with_call_c hain' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:494:in `invoke' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1931:in `invoke_task' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `top_level' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `each' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `top_level' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exceptio n_handling' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1903:in `top_level' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1881:in `run' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exceptio n_handling' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1878:in `run' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/bin/rake:31 c:/ruby/bin/rake:19:in `load' c:/ruby/bin/rake:19
C:\testror\depot>